JPH0521272A - Chip type lc composite part and manufacturing method thereof - Google Patents

Abstract

PURPOSE:To provide a chip type LC composite part with a simple structure and manufacturing process, excellent mass-productibity, and also low production costs, and a manufacturing method thereof. CONSTITUTION:A conductive wire is formed on the surface of a beltlike magnetic body green sheet 4, which is wound around a core member 1 comprising a magnetic body, and a coil 7 comprising the conductive wire is formed around the core member 1 and a magnetic body sheet is wound around the coil 7. Further, a dielectric sheet formed with a capacitance electrode is wound around the coil 7 and the magnetic body sheet, and the coil is electrically connected to the capacitance electrode on the dielectric sheet to integrally assemble them. Thereafter, an external electrode which is connected to the coil or the capacitance electrode is formed on the surface of an assembly to obtain a chip type LC composite part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chip type LC composite component used in various electronic circuits and a method of manufacturing the same.

[0002]

2. Description of the Related Art In recent years, with the miniaturization, high integration and high frequency of electronic circuits, a chip type L that is small and can be surface-mounted
Demand for C composite parts is increasing.

Conventionally, as this type of LC composite part, a hybrid type LC composite part is known in which a coil and a capacitor are arranged on a substrate and bonded to each other and then molded with a resin or the like. Alternatively, a laminated LC composite in which both a coil portion formed by alternately printing a magnetic material and a spiral conductor pattern and a capacitor portion formed by alternately printing a dielectric material and a capacitor electrode are formed and stacked. The parts are known.

[0004]

By the way, these conventional chip type LC composite parts have a problem that the hybrid type has a complicated structure and manufacturing process, is inferior in mass productivity, and has a high manufacturing cost. In the laminated type as well, a magnetic material and a conductor pattern are alternately printed to form a coil, and a dielectric and a capacitor electrode are alternately printed to form a capacitor, and each conductor pattern is connected to form an LC composite. Since the parts are obtained, there is a problem that the structure and the manufacturing process are complicated, mass productivity is poor, and the manufacturing cost is high.

An object of the present invention is to provide a chip type LC composite component having a simple structure, excellent mass productivity, and low manufacturing cost, and a manufacturing method thereof.

[0006]

In order to achieve the above-mentioned object, a chip type LC composite component according to the present invention comprises: (a) a strip-shaped magnetic material sheet having a conductor line formed on a part of its surface,
A magnetic core member in which the strip-shaped magnetic sheet is wound,
A coil formed around the core member by the conductor line on the strip-shaped magnetic sheet, a magnetic sheet surrounding the coil formed around the core member, and (b) surrounding the coil and the magnetic sheet. A surrounding dielectric sheet and a capacitor section composed of a capacitance electrode formed on the dielectric sheet, (c) a coil and an external electrode connected to the capacitance electrode, and (d) a capacitance of the coil and the capacitor section. It is characterized in that it is electrically connected to the electrodes.

The method of manufacturing a chip-type LC composite component according to the present invention comprises: (e) a step of forming a conductor line on the surface of a strip-shaped magnetic material sheet; and (f) the strip-shaped magnetic member formed on the core member made of a magnetic material. Winding a magnetic sheet to form a coil by the conductor line; (g) winding a magnetic sheet around the coil; and (h) forming a capacitive electrode around the coil and the magnetic sheet. The process of winding the dielectric sheet,
(i) electrically connecting and integrally assembling the coil and the capacitive electrode on the dielectric sheet; and (j) external electrode connecting to at least one of the coil and the capacitive electrode. And a step of providing it on the surface of.

[0008]

In the chip type LC composite component according to the present invention, as described above, the strip-shaped magnetic material sheet on which the conductor line is formed is wound around the core member made of a magnetic material to form a coil, and Since a sheet made of a magnetic material is arranged outside the coil, when a current flows through this coil, most of the generated magnetic flux has a closed magnetic path structure that passes through the inside of the core member and the magnetic material sheet. Functions similar to those of a normal cored toroidal coil. Moreover, since a dielectric sheet having a capacitive electrode is wound around the coil and this dielectric sheet functions as a capacitor, there is no fear that the size of the component will be significantly increased due to the capacitor section.

Further, according to the above-mentioned manufacturing method of the present invention, the coil is formed by winding the strip-shaped magnetic sheet having the conductor line formed on the core member of the magnetic body, and the dielectric sheet is further provided around the coil. Since the capacitor is formed by winding, it is not necessary to alternately stack the magnetic material and the conductor pattern as in the conventional laminated LC composite component, so that the process period can be shortened and the manufacturing process can be simplified. Be converted.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the chip type LC composite component and its manufacturing method according to the present invention will be described below with reference to the accompanying drawings.

First, as shown in FIG. 1, a magnetic core member 1 is prepared. The magnetic core member 1 is formed, for example, by molding a ferrite magnetic powder containing diiron trioxide (Fe ₂ O ₃ ) as a main component to which a binder is added into a cylindrical shape by a press molding machine.

Conductor lines 2 and 3 are formed on the surface of the magnetic core member 1 using silver paste or the like. The conductor lines 2 and 3 are conductors 2 a, 3 formed on the end surface of the core member 1.
a, conductors 2c, 3c, and 2a, 2c, and 3a formed along the circumferential direction at the outer peripheral portions near both ends of the core member 1.
And 3c, respectively, and conductors 2b and 3b for connecting them.

Next, as shown in FIG. 2, a magnetic green sheet 4 is prepared. The magnetic green sheet 4 has the same composition as that of the magnetic core member 1, that is, a ferrite magnetic powder containing diiron trioxide (Fe ₂ O ₃ ) as a main component is kneaded with a binder, a solvent, etc. The sheet is formed into a thin sheet having a thickness of several tens to several tens of μm, a plurality of the sheets are pressure-bonded to obtain a desired thickness, and then cut into strips. A conductor line 5 is formed on one surface of the green sheet 4 by using silver paste or the like except the both ends. The conductor 6 is formed on the back surface of the middle portion of the green sheet 4 using silver paste or the like, and the conductor line 5 and the conductor 6 are formed on the side surface of the green sheet 4 using silver paste or the like. It is connected by 5a.

As shown in the side view of FIG. 3, at the center of the magnetic green sheet 4, the conductor line 5 is formed by the conductor 5a on the side face of the green sheet 4 on the back surface of the surface on which the conductor line 5 is formed. It is connected to the formed conductor 6.

Next, as shown in FIG. 4, the magnetic core member 1 is used.
A coil 7 is formed by winding a magnetic green sheet 4 from around one end of the core member 1 with the conductor line 5 inside.

As shown in the sectional view of FIG. 5, when the magnetic green sheet 4 is wound around the magnetic core member 1, the end of the conductor line 5 on the green sheet 4 is terminated by the magnetic core member 1. It is connected to the upper conductor line 2c, and similarly, the other end of the conductor line 5 is connected to the conductor line 3c on the magnetic core member 1. When the green sheets 4 are tightly wound, it is necessary to prevent the adjacent conductor lines 5 from coming into contact with each other to prevent a short circuit. However, as shown in FIG. 5, the green sheets 4 are gradually overlapped with the adjacent sheets 4. It is good to wind it up.

FIG. 6 shows a state in which the magnetic green sheet 4 is wound around the magnetic core member 1 to form the coil 7. Here, the conductor line 5 is formed around the magnetic core member 1.
Since the coil 7 is formed by winding the magnetic green sheet 4 on which the magnetic material is formed, the magnetic material and the conductor pattern are alternately stacked when forming the coil as in the case of the conventional laminated LC composite component. I don't need it,
The process period can be shortened and the manufacturing process can be simplified.

Next, as shown in FIG. 7, a magnetic green sheet 8 is wound around the coil 7 as a core. The magnetic green sheet 8 has a composition similar to that of the magnetic green sheet 4, that is, a ferrite magnetic powder containing diiron trioxide (Fe ₂ O ₃ ) as a main component is kneaded with a binder, a solvent, etc. The sheet is formed into a thin sheet having a thickness of several tens to several tens of μm, and a plurality of the sheets are pressure-bonded to obtain a desired thickness. The conductor 9 is formed on one side of the green sheet 8 using silver paste or the like, and the conductor 9 and the conductor 6 on the green sheet 4 are on the side surface of the green sheet 8 formed using silver paste or the like. It is connected by the conductor 9a.

By thus winding the magnetic green sheet 8 around the coil 7, the coil 7 is protected, and most of the magnetic flux generated by the current flowing through the coil 7 is a magnetic core member. 1 and magnetic sheet 8
Since it has a closed magnetic circuit structure that passes through the inside of, the same function as a so-called normal cored toroidal coil is exhibited.

FIG. 8 shows a state in which the magnetic green sheet 8 is wound around the coil 7. The conductor 9 on the green sheet 8 passes through the conductor 6 on the green sheet 4 and then the conductor line 5
Is connected to the intermediate part of the coil, that is, the intermediate part of the coil.

Next, as shown in FIG. 9, a coil 7 wound with a magnetic green sheet 8 is attached to the capacitor electrodes 11 and 12.
A dielectric green sheet 10 provided on both sides is wound to form a capacitor section. The capacitor electrode 11 is connected to the conductor 9 on the magnetic green sheet 8. The dielectric sheet 10 is obtained by kneading, for example, a dielectric powder containing TiO ₂ as a main component with a binder, a solvent and the like to form a paste, and forming a thin sheet having a thickness of several tens to several tens of μm. In some cases, a plurality of the above-mentioned sheets are pressure-bonded to obtain the above thickness. Using silver paste etc. on the upper and lower surfaces of the sheet 10,
The capacitive electrodes 11 and 12 are formed by a method such as screen printing. The capacitor section may have a single-layer structure as in this embodiment, or a laminated capacitor structure in which capacitive electrodes and dielectric sheets are alternately laminated.

Here, a coil is formed by winding a strip-shaped magnetic material sheet having a conductor line formed on the core of a magnetic material, and winding the magnetic material sheet on the magnetic material sheet, and further winding a dielectric material sheet on the coil. Since the capacitor is formed, it is not necessary to alternately stack the magnetic material and the conductor pattern as in the conventional laminated LC composite component, and the process period can be shortened and the manufacturing process can be simplified. .

FIG. 10 shows a state in which the dielectric green sheet 10 is wound around the magnetic green sheet 8 with the capacitor electrode 12 on the outside.

Next, as shown in FIG. 11, the dielectric sheet 1
A dielectric green sheet 13 is further wound around 0. This green sheet 13 is the green sheet 1.
In the same manner as 0, for example, a dielectric powder containing TiO ₂ as a main component is kneaded with a binder, a solvent and the like to form a paste, and a thin sheet having a thickness of tens to tens of μm is formed to obtain the desired thickness. A plurality of sheets are pressure bonded. The green sheet 13 is a capacitor electrode 12 on the green sheet 10.
This is for protecting the capacitance electrode 12 while avoiding the exposure, and is not necessarily a dielectric. The conductor 14 is formed on one side of the green sheet 13 using silver paste or the like, and the conductor 14 and the capacitor electrode 12 on the green sheet 10 are formed on the side surface of the green sheet 13 using silver paste or the like. Are connected by the conductor 14a.

FIG. 12 shows a state in which the dielectric green sheet 13 is wound around the dielectric green sheet 10.
The green sheet 13 wound around the green sheet 10 as described above is set in a cold isostatic press and then pressurized, so that the magnetic core member 1, the magnetic green sheet 4, and the magnetic material The green sheet 8, the dielectric green sheet 10 and the dielectric green sheet 13 are pressure bonded to form a pressure bonded body 15.

External electrodes 16, 17 and 18 are formed on the sintered body obtained by putting the pressure-bonded body 15 in a firing furnace and integrally firing it at a predetermined firing temperature and time, as shown in FIG. . The external electrode 16 is connected to the conductor line 2a on the end surface of the magnetic core member 1, and the external electrode 17 is connected to the conductor line 3a on the other end surface of the magnetic core member 1. Further, the external electrode 18 is connected to the conductor 14 on the dielectric sheet 13, and is electrically connected to the capacitance electrode 12 of the capacitor portion via the conductor 14a. The external electrodes 16, 17 and 18 may use metal caps, or may be formed by applying a silver paste or the like and then firing. Thus, the chip-type LC composite component 19 that can be surface-mounted on the printed wiring board or the like is obtained.

The chip-type LC composite component 19 thus obtained has a closed magnetic circuit structure in which most of the generated magnetic flux passes through the magnetic core member 1 and the magnetic sheet 8 when a current flows through the coil. The same function as a so-called normal cored toroidal coil is exhibited. Moreover, a dielectric sheet having a capacitance electrode is wound around the coil portion, and since this dielectric sheet functions as a capacitor, there is no fear that the component size will be significantly enlarged due to the capacitor portion.

FIG. 14 is an equivalent electric circuit diagram of the chip type LC composite component 19. The coil is divided into two inductances L1 and L2 at the intermediate portion 6 of the conductor line 5, and one end of these inductances L1 and L2 is connected to the external electrode 1
6 and 17 are electrically connected. The other ends of L1 and L2 are electrically connected to the capacitance electrode 11 of the capacitor C1 at the intermediate portion 6 of the conductor line 5, and the other capacitance electrode 12 of the capacitor C1 is electrically connected to the external electrode 18. There is.

The chip-type LC composite component and the method for manufacturing the same according to the present invention are not limited to the above-mentioned embodiment, but can be variously modified within the scope of the invention.

In this embodiment, the case of the T-type LC composite component has been described, but an L-type or π-type LC composite component can be constructed by changing the connection point of the coil part and the capacitor part. .

[0031]

As described above, according to the present invention, a coil is formed by winding a strip-shaped magnetic material sheet around which a conductor line is formed around a core member made of a magnetic material, and outside the coil. Since a sheet made of a magnetic material is provided, when a current flows through this coil, most of the generated magnetic flux has a closed magnetic circuit structure that passes through the inside of the core member and the magnetic material sheet. The same function as the coil is exhibited.

Moreover, a dielectric sheet having a capacitance electrode is wound around the coil portion, and this dielectric sheet functions as a capacitor, so that there is a possibility that the component size may be greatly expanded due to the capacitor portion. Absent.

In manufacturing the chip-type LC composite component according to the present invention, a coil is formed by winding a strip-shaped magnetic material sheet having a conductor line formed on a magnetic core member, and a capacitor electrode is further provided around the coil. Since the capacitor is formed by winding the dielectric sheet having the magnetic field, it is not necessary to alternately stack the magnetic material and the conductor pattern as in the conventional laminated LC composite component, and the process period can be shortened. As well as simplifying the manufacturing process,
Chip type LC with excellent mass productivity and low manufacturing cost
A composite part is obtained.

[Brief description of drawings]

FIG. 1 is a perspective view illustrating a configuration of the present invention, showing a core member of a magnetic body and a conductor line.

FIG. 2 is a perspective view illustrating the configuration of the present invention, showing a strip-shaped magnetic green sheet and a conductor line.

FIG. 3 is a partially cutaway side view of a belt-shaped magnetic green sheet for explaining some steps of the manufacturing method of the present invention.

FIG. 4 is a perspective view of a coil for explaining some steps of the manufacturing method of the present invention.

FIG. 5 is a partially cutaway sectional view of a coil for explaining a part of the process of the manufacturing method of the present invention.

FIG. 6 is a perspective view of a coil for explaining some steps of the manufacturing method of the present invention.

FIG. 7 is a perspective view of a coil for explaining some steps of the manufacturing method of the present invention.

FIG. 8 is a perspective view of a coil for explaining a part of the steps of the manufacturing method of the present invention.

FIG. 9 is a perspective view of a coil and a capacitor for explaining some steps of the manufacturing method of the present invention.

FIG. 10 is a perspective view of a coil and a capacitor for explaining some steps of the manufacturing method of the present invention.

FIG. 11 is a perspective view of a coil and a capacitor for explaining some steps of the manufacturing method of the present invention.

FIG. 12 is a perspective view of a crimp body for explaining a part of the steps of the manufacturing method of the present invention.

FIG. 13 is a perspective view of a chip-type LC composite component according to the present invention.

FIG. 14 is an equivalent electric circuit diagram of the chip-type LC composite component according to the present invention.

[Explanation of symbols]

1 Magnetic core member A few conductor lines 4 Magnetic green sheet 5, 6 conductor track 7 coils 8 Magnetic green sheet 9 conductor lines 10 Dielectric green sheet 11,12 Capacitance electrode 13 Dielectric green sheet 14 conductor lines 15 Crimped body 16, 17, 18 External electrodes 19 Chip type LC composite parts

Claims (2)

[Claims] 1. A strip-shaped magnetic sheet having a conductor line formed on a part of its surface, a magnetic core member wound with the strip-shaped magnetic sheet, and a conductor line on the strip-shaped magnetic sheet. A coil formed around the core member, a magnetic sheet surrounding the coil formed around the core member, a dielectric sheet surrounding the coil and the magnetic sheet, and formed on the dielectric sheet A chip-type L, characterized in that it is provided with a capacitor part formed of a capacitor electrode and an external electrode connected to the coil and the capacitor electrode, and the coil and the capacitor electrode of the capacitor part are electrically connected.
C composite parts. 2. A step of forming a conductor line on the surface of a strip-shaped magnetic sheet; a step of winding the strip-shaped magnetic sheet around a core member made of a magnetic material to form a coil of the conductor line; Winding a magnetic material sheet around it, winding a dielectric sheet having a capacitance electrode formed around the coil and the magnetic material sheet, and electrically connecting the coil and the capacitance electrode on the dielectric sheet. A chip type L comprising: a step of integrally assembling; and a step of providing an external electrode connected to at least one of the coil and the capacitive electrode on a surface of the assembly.
C Composite part manufacturing method.